masterThesis
Caracterização do lodo de lagoa anaeróbia tratando resíduos esgotados de tanques sépticos e fossas com vistas ao aproveitamento
Fecha
2012-12-28Registro en:
ASSUNÇÃO, Marcella de Sá Leitão. Caracterização do lodo de lagoa anaeróbia tratando resíduos esgotados de tanques sépticos e fossas com vistas ao aproveitamento. 2012. 80 f. Dissertação (Mestrado em Saneamento Ambiental; Meio Ambiente; Recursos Hídricos e Hidráulica) - Universidade Federal do Rio Grande do Norte, Natal, 2012.
Autor
Assunção, Marcella de Sá Leitão
Resumen
The sludge generated in stabilization ponds can be designed for various purposes,
among them we mention agricultural use, recovery of degraded areas and civil
construction. The choice of these alternatives should be made based on qualitative
and quantitative characteristics of the sludge. In this context, this study characterized
the digested sludge from an anaerobic lagoon in Cidade do Natal/RN, which deals
exclusively with residues of depleted septic tanks and pits. The sludge showed levels
of macro and micronutrients that confirm its potential for agriculture, with 139.49 g.kg
-1 organic matter, 15.40 g.kg-1 nitrogen and metal concentrations below those
required by Resolution No. 375/06 of CONAMA, besides the absence of fecal
coliform and less than 0.15 viable helminthes eggs/g, on average. The particle size
distribution showed that most of the particles have a diameter similar to the sand,
allowing the replacement of this input, for example. Analysis of the leachate and of
the sludge solubilized classified as non-inert and non-hazardous according to NBR
10.004/04. The volume produced in three years of operation by the pond was
1903.50m³, equivalent to approximately 400 kg of dry sludge. Overall, the
concentrations of the parameters were similar to literature, although none of them
addresses sludge anaerobic pond treating sewer from septic tanks and pits.The
sludgepresents technical feasibility to various types of use, however the cost of
dewatering and especially with transport can derail it. It needs to be made a more
thorough study of the costs to prove its economic viability